This is a pack of optional JConcepts B5/B5M Aluminum Ultra Front Wheel Hexes. Converting the front of the RC10B5 or B5M to an ultra, light-weight hex adaptor set from JConcepts is quick and simple. These hex adaptors are precision machined, blue or black anodized and feature a fluted design that eliminates any unnecessary rotating weight. The aluminum material combined with clamping design and light-weight styling delivers durability and functionality. Installation is simple, slide on the hex to either the JConcepts Titanium axle (JCI2346T) or standard AE axle (ASC91408) and cinch the 2.0mm screw with slight pressure to maintain position.